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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc0abfea5730c5622054075f46a6d97a976de1e522e0975f02ccbbcd3321cf8e' 
  AND token = 'Wf37p8FCD89vbjt60tn5qB5l8N6fNEUcJKudv94R5EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}